AUMA are glad to announce that the products of the new generation of electric variable speed actuators, types SAV .2 and SARV .2, are now available.
The proven AUMA SA/SAR range is enhanced by variable speed models. SAV multi-turn actuators for open-close duty and SARV multi-turn actuators for modulating duty are paired with intelligent ACV 01.2 actuator controls. Variable speed offers several significant advantages. For any change of valve position, the optimum operating speed can be adjusted. To optimise this capability, new functions have been integrated into AUMA ACV actuator controls:
With SAV .2 for open-close duty and SARV .2 for modulating duty, multi-turn actuators, are paired with intelligent ACV .2 actuator controls. The proven AUMA SA/SAR range is enhanced by variable speed models. AUMA are spearheading market technology offering a broad speed control ratio.
Variable speed offers significant advantages. For any change of valve position, the best possible operating speed is adjustable. To optimise this competence, new functions have been integrated into AUMA ACV actuator controls:
Soft start and soft stop
Operations out of an end position start at zero velocity. By means of a ramp function, speed is increased until the predefined setpoint value. Soft stop is the exact opposite: Prior to reaching the end position, the velocity is linearly decreased. The advantage is gentle service for all valve and actuator components subject to wear.
Higher positioning accuracy
Like for operation into the end position, the actuator decreases the operating speed when approaching the setpoint valve position down to zero velocity. This allows for more accurate actuator positioning to the setpoint compared to the sudden tripping of a fixed speed actuator. This ability is particularly crucial for the SARV modulating duty model.
External impact on speed
The variable actuator speed is an additional control variable to optimise a control process within the control system. To this end, the SARV speed can be adjusted by an external input.
Operation profile including up to eight position pivot points.
Speeds can be defined for up to eight positions for each operational direction. Speed increase or decrease prior to reaching these pivot points is also supported using a ramp function. Typically, this function is desired for avoidance of pressure surges when closing valves in pipework.
EMERGENCY operation at predefined speed
EMERGENCY operations are executed at a predefined and frequently high speed to suit the particular event.
This function characterises total synchronous operation of two actuators in spite of the absence of mechanical links. The actuators have a master – slave relationship. The master device specifies the speed which is in turn adopted by the slave.